docs: reframe homepage as the Design Systems Styling Engine

[alexgrozav]

Implements the homepage reframe from SF-14 (Maître's approved proposal, Alex signed off). PR to Étoile for review.

What changed

• apps/docs/content/index.md:
  • Hero — H1 "The styling engine for your design system"; new subhead; frontmatter title/description carry the category line + meta/social one-liner. Kept the styleframe.config.ts snippet and both CTAs.
  • Reordered to the story spine: one source of truth → typed → zero-runtime → every bundler → scanner/figma. Section titles/intros retargeted to the engine framing.
  • Bundler copy corrected to the real nine: Vite, Nuxt, Webpack, Rollup, esbuild, Rspack, Farm, Astro, Bun (proposal's eight omitted Bun).
  • AI section kept as Coming Soon.
• apps/docs/nuxt.config.ts — site.name (ogSiteName / meta category line) → "Styleframe — The Design Systems Styling Engine".

Interpretation notes for review

• Beats B (typed) and D (bundlers) are carried as reframed feature cards inside the "one source of truth" grid, not as new standalone demo sections — the repo has no existing typed/bundler demo to promote, and fabricating one would break the "no example ships unrun" rule. If a dedicated section is wanted, it needs a real demo from the owning seat.
• Composability + Theming sections kept (not deleted) and folded under the "one source of truth" beat — mise didn't ask to cut them and they carry good interactive demos.
• Proof-point links: /figma and /scanner resolve; the typed proof links to /docs/api, the bundler proof to /docs/getting-started/installation. "playground" and "testing/integration" have no public doc route, so I linked to the closest resolvable docs pages rather than invent links.

Findings (not blocking this PR)

• testing/integration does not enumerate bundlers — it scaffolds a Vite-only app tested cross-browser. The authoritative bundler set is the @styleframe/plugin export map (tooling/plugin/package.json + src/*.ts), which is where I verified the nine.
• The docs-craft skill says to verify with pnpm --filter @styleframe/docs typecheck, but @styleframe/docs has no typecheck script. Docs verify via build. Flagging for a skill fix.
• content/docs/02.api/13.imports.md and 14.imports.md list only five bundlers as "all supported build tools" — incomplete vs the nine. Small drift, filed for a follow-up.

Verification

• pnpm install && pnpm build:nodocs — spine built (plugin adapters incl. bun compiled).
• pnpm --filter @styleframe/docs build — build complete, MDC/frontmatter valid, homepage prerendered with the new copy.
• Links: every touched route verified against apps/docs/.data/content/contents.sqlite (11/11 resolve, count=1 each).
• npx oxlint apps/docs/nuxt.config.ts — ok.
• No changeset (@styleframe/docs is in the changesets ignore list).

Closes acceptance for the docs half of SF-14.

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